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Turn on the tablet and follow the steps from the tab screen
1. From the home screen, tap your Apps icon, and go to Settings.
2 Select Backup and Reset on Android 2.3 Gingerbread and above.
3 Select Factory data reset.
steps from the physical button
Make sure that the device is fully powered down.
Find your device key combination, and press and hold it to boot your Android device in recovery mode
Combination 1 - Volume Up + Camera button.Combination 2 - Volume Down + Power button.Combination 3 - Volume Up + Power button.Combination 4 - Volume Up + Home + Power button.Combination 5 - Volume Down + Volume Up + Power button.Combination 6 - Home + Camera button.Combination 7 - Home + Power button
Release the buttons when the device is powered on.You will see the device booting into recovery mode.
Press the Volume Up and Volume Down keys to scroll up or down through menu options.
Select Wipe data/Factory reset with the volume keys.
Press the Power button to confirm your selection.
Continuing to use the volume buttons, Select Yes – erase all user data
Your device will now be reset to its factory default state.
You need to power off the device first to attempt the steps one by one.
let the battery be charged for an hour and then you try the steps i gave.